Implementation of the famous printf function using VAR_ARGS with most of its flags.

int ft_printf(const char *format, ...);

Any of these specifiers following a percent will be interpreted.
Also between the percent and specifiers many flags can be set to modify the length | precision | prefix | padding ...
%[-+ #0][\d\*][hh|h|ll|l|j|z][%sSdDioOuUxXcCbBfF]

1. % print the character '%'.
2. s print the string at the address given.
3. S print the string with unicode at the address given
4. p print the address in hexadecimal.
5. d print the integer in base 10
6. D same as d.
7. i same as d.
8. o print the integer in base 8
9. O same as o.
10. u print the unsigned integer in base 10.
11. U same as u.
12. x print the integer in base 16.
13. X same as x but capitalize the letters.
14. c print the character.
15. C print the unicode character.
16. b print the integer in base 2.
17. B same as b
18. f print the float number.
19. F same as f.